GAP Baby Denim Color Hat Size: ~46cm The chin strap fastens with Velcro. The inside is a thin, soft fabric like knit. This was a gift, but I have kept it at home without using it even once after washing it. It has wrinkles because it was stored with other clothes, but I think the wrinkles will come out to some extent if you wash it and shape it before drying. Please purchase only if you understand that it has been stored at home. It will be packed compactly and shipped via Yu-Packet Post Mini.